Question: rewiring motor from 110 to 220


I want to rewire a motor from 110 to 220 on a new bandsaw. It came wired for 110. I think I know how to do this... I did it on a jointer last year. The diagram is usually inside the motor cover. When I rewired the jointer, I had to replace the ON/OFF switch (said so in the manual, so I followed instructions). The bandsaw manual makes no mention of changing the switch, only rewiring the motor. Does anyone know about this? Does the ON/OFF switch have to be changed or rewired as well?
Tom
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Yes, you now have two hot wires, and the switch must disconnect both. In short, the switch needs to be DPST (that is double pole single throw). If yours isn't, then you need a new switch. Jim
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Authoritative answer: "It depends".
On the existing switch, how it is currently wired, how it _can_ be wired, and whether or not you like gambling with your life. <grin>
To be safe (and incidentally "code-compliant" in most locales) you need to have a 'double-pole' switch for 220(240) V devices. this way the switch disconnects "all" the hot wires, and, when in the 'off' position, there are no dangerous voltages present 'downstream' of the switch. For 110 (120) V it is only necessary to disconnect the one 'hot' wire. you _can_ disconnect the 'neutral' as well in that set-up -- it doesn't hurt anything to do so.
*IF* the current switch is presently wired to disconnect both leads, then you don't have to do anything at the switch.
OTOH, if the switch only switches one wire, then changes _do_ need to be made. If the present switch can handle two wires, you just have to change the wiring at the switch. BUT, if the present switch can only handle one wire, then you need to replace the switch.
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